Having holes evenly all around the head could be benefitial in that the head will be vibrating more evenly across the entire surface, which probably results in a more even tone and longer sustain. Just a theory...

The best solution however, is to not bury the damn beater. It doesn't take more than a month to completely revamp your foot technique, and play without burying the beater without even thinking about it. You'll have more options in tuning, and you get a lot more vibration between the heads = more sustain and more low end.